Equalizing table slide



May 24, 1932. w. A, DUNCAN 1,860,019

EQUALI Z ING TABLE SLIDE Filed April 1, 1929 2 Sheets-Sheet 1 liizhginn 1 .,26, 22 WiDw'wa/L 5mi@ May 24, 1932- w. A. Alm mlcAN 1,860,019

EQUALIZING TABLE SLIDE n 2 Sheets-Sheet 2 Filed April 1, 1929 17@ 40. 0 7 .54 20@ .5%. 7 54g a l rmwzcan/ www autoweg@ Patented May 24, 1932 vWILLIAM A. DUNCAN, or srATEsvILLE, NORTH Glutei-river` EQUALIZING TABLE SLIDEV Appiieation mea Apriiji, Y1929. seria'i No1 351,713.

This invention aims to provide la novelv equalizing device enabling the end portions i of an eXtensiontable to be pulled apart or? pushed together easily and smoothly, with- 5 out regard t0 the force which is applied to the respective ends of the table. Another object ofthe invention is to provide a novel con nector or guide uniting the parts of the' table for 'relative sliding movement.

It is within the province of the disclosure to improve generally and to enhance the utility of devicesof that sort to which the invention appertains. v

A preferred form of the invention has beenjshown in the drawings; it will be understood, though, that a mechanic, working within thel scope of what is claimed, may

make such changes as his skill may suggest,

without departing from the spirit of .the invention. v

In the accompanying drawings Y Figure 1 shows, in end elevation, a device constructed in accordance with the invention, embodied in a table;

Figure 2 is a section on the line 22 of Figure 1; y

Figure 3 is a transverse section on the line 3-3 of Figure 2; Y

Figure 4 is a bottom plan, wherein parts are broken away;

Figure 5 is a transverse section taken through the equalizing mechanism;

Figure 6 is a section on the line 6-6 of Figure 3;

Figure 7 is a section on the line 7-7 of Figure 3;

Figure 8 is an end elevation showing a mo dification Figure 9 is a 'section on the line 949 of '40 Figure 8; v

Figure 10 is a cross-section on the line 10-10 of` Figure 9.

The device forming the subject matter' of this ap lication is adapted to be used in tables of) widely different kinds, but, by way of illustration, the table is depicted as comprising a base 1 which includes a. pedestal 2 on which a cap 3 is secured, in the usual manner.

Referring to the form shown in Figures 1 to 7, the device forming the subjectvinatter of this application is made in pairs, as Figure` 1 will show,but since these pairs are dupli-Y cates, but one member ofthe pair will be de-Y scribed.

The device includes Van' inner member'4, in

the formof a beam, the member 4 being secured to the cap 3. Outer members 5,'in the A form of beams, slide longitudinal fon each side of the inner membe'r4,'the outer mein-- bers being connected to the respective end sections.6 o-f the table. The openings 7, appearing in VFigure 2, are/for thereception of the securing elements wherebyV the vouter members 5 are connected to the end sections" of the tablev asy aforesaid. The inner member 4giisV provided'on each side withfa longitudinal groove 8, at the inp ner end of which 'there is a slot9 which issomewhat wider than the groove 8,1a Vconstruction which will be understood readily lwhen Figures 5 and 7 are compared."y On the Vinnerside of theouter members 5 there are The invention comprises metal 14,15, 4and 16. Each guide includes a troughshaped body 21, at the inner end of which there is wall 22 adapted to serve as an abut-- guides 12,r

ment. i The body 21 is provided'at its edges u with outstanding flanges 23.-

' Y Referring to Figure 2, the guides 12, and"` 14 are located opposite to each other, at ione endof the device, and theguidesfl and 16 are locatedopposite toeach other, atthe other end Vof the device. Thev guides 12: and

16 are secured to the outer members at opposite ends of thedevice, and the guides/15 and 14 are secured to the respective sides of the inner member 4, at vopposite ends of the device. The flanges 23l of the-guide 12 andV the anges 23 ofthe guide 16 slide vin the 95' slots 9 ofthe inner member 4, whereas the flanges 28 of the guide 1.5 and of the guide 14 slide in the slots 11 of the outerA members f 5. One of the outer members 5 has a stop pin 17 adapted to cooperate with the abutment wall'22 of the guide 14 the other outer Vthe end sections 6 of the table are pushed together. In order to limit the movement when the end sect-ions 6 of the table are drawn apart, spacers 19 and 20, preferably/in the form of wooden rods of rectangular crosssection, are provided, spacer 19 beingfreely slidable between the guides 15 and 12, spacer 20 being freely slidable between the guides 16 and 14. The spacers 19 and 20 are located inthe longitudinal passages formed by the grooves 8 and 10 and the slots 9 and 11, an observation which will be readily understood'when Figure 5 of the drawings is eX- amined.

Having thus described the means whereby the parts 4 and 5 are slidably connected and limited in their sliding movement, referencev will now be had to the equalizing mechanism, by which motion is transmitted to one endoi' the table, when the other end section of the table is pushed in or pulled out.

ad recesses 24 being disposed'immediately ad- There are longitudinal'recesses 24in the lower surfaces of the outer members 5, the

jacentl to the inner member 4. The inner member 4 is provided on its lower surface and` at a point intermediate its ends with a seat 25. Trough-shaped rack bars 26 are located in the recesses 24 and are held therein by securing elements 27. In what may becalled the bases of the trough-shaped rack bars, there are openings 28. A bracket 29 is located inthe seat 25 and is secured at 30 to the inner member 4. A pinion 31, disposed between the central .part of thebraoket 29 and theY inner member 4, meshes with the openings 28 in the rack bars 26the pinion being journaled on a stubshaft 32,v carried by bracket 29. It is clear that when one of the outer members 5 is pushed or pulled in one direction motion will be transmitted to the other member' 5V by the-rack bars 26 and the pinion 31,v an -equalizing movement thus being accomplished with respect to the end sections 6 of the table. Y, n

It is not necessary that the metal guidesv 12,. 14, 15, .and.16 be used in connection with theequalizingmechanismf In Figures 8, 9, and 10, parts hereinbefore described have rvbeendesignated by numerals'previously used,

with the suiiix a, In this form of the invention, the groove' and slotv construction 1 secured, -this gluing taking 1 the. place of the .f 1 rscrews3,5thathold1the guides 15, 16, 14, and..

12 in Figure 2. Some persons mav desire to secure the guides 34 in 'place otherwise than by gluing them, and this is permissible. Figures 8 to 10 show that the eoualizing device guide of Figures 2 and 3, and the metal guide is not confined to use with thev mechanism for equalizing.k

Having thus described the invention, what is claimed is f Equalizing mechanism for? an extension table, comprising an inner member, outer members slidable on opposite sides of the inner member, the outer members being provided with recesses, racks housed completely in the recesses and fitting closely therein, the

racks being troughv shaped in cross sectionapproximately parallel and comprising flanges Vand a wall connecting the ianges, the

wall having openings, and the free edges ofY the flanges abutting against the bases of the recesses, securing devices passing through the said walls of the racks andentering the outer members, a pinion meshing withrthe openingsr of the racks, and means for mounting the pinion forl rotation on the inner member.

In testimony that I claim the foregoing as my own, I have hereto afliXed my signature.

TWILLIAM A. DUNCAN.

vmay be used with a guide other than the metal i l. 1L, 

